Shuttle changing loom



June 11, 1935. l.. s. vosE 2,004,681v

SHUTTLE CHANGING LOOM Original Filed April 4, 1932 4 Sheets-Sheet 1 msentor ems 3 Bose torneqs June 11, 1935. L. s. Voss 2,004,681

SHUTTLE CHANGING LOOM Original Filed April 4, 1932 4 Sheets-Sheet 2 ems use MQW* M (ltnornegs June 11, 1935. L. s. VOSE 2,004,681

SHUTTLE CHANGING LOOM original Filed April 4, 1932 4 sheets-shea 3 Snuentor iews 5. U0 se June 11,v 1935. L.. s. VOSE Y SHUTTLE CHANGNG LOOM Original Filed April 4, 1952 4 Sheets-Sheet 4 K gmxentor iemis Bose Patented June 11, 1935 SHUTTLE cnANoiNo LOOM Lewis S. Vose, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass., a corporation of Massachusetts Original application April 4,1932, Serial No.

Divided and this application May 24, 1933, Serial No. 672,667 y 1 7 claims. (01-139.427)

This is a division of 603,051.

This invention relatesv to shuttle changing looms and it is the general object of the .invenmy application Serial No.

tion to provide means to prevent resumption of weaving after a shuttle change if the pick'laid by the outgoing shuttle be defective.

In weaving high grade fabrics a center filling stop motion is used so that each pick may be detected. When a pick-out is made, the short pick is removed and the pattern chain turned rback to open the shedon the good pick preceding the defect. This pick has previously been beaten into the fell of the cloth and is therefore out of reach of the filling fork. The latter would therefore be unsupported and would act'to stop the loom, even though a pick was in the shed. To prevent an unneeded stoppage thereis provided a shield which moves in front4 of the knockoff notch when the loom stops, and deflects the dagger away from the notch on the first beat up after the pick-ou On thel following pick the stop motion is free to operate because "of restoration of the shield to normal position.

Because of this characteristic ofthe center stop motion, the last iiight of the outgoing shut-V tle of a loom which stops to change shuttles can lay a defective pick which will not be detected. On the first pick of the new shuttle there will be a whole pick in the shed, and the loom will continue to run. The mispick of the previous shuttle will therefore be incorporated in'tothe fabric. It is accordingly an important object of my present invention to providemeans which shall operate to prevent operation of the loom subsequent to transfer when the last pick laid by the outgoing shuttle is defective.

It is another important object of my invention to provide means for retaining tension on the weft at the time of shuttle change until the shed aga-in crosses. In the type of loom to which my invention more particularly relates the shed is open during a shuttle changing operation and as a result of this condition there is the chance that the reserve bunch in the outgoing shuttle will be so small as to be entirely free from the shuttle before the latter comes to rest in the receiving box for exhausted shuttles. Under these conditions the tension of the weft caused by the shuttle eye is lost and a loose pick results. I provide means for clamping v'the weft so as to maintain the tension thereon until after the sheds have crossed subsequent tothe resumption of weaving.

With these and other objects in View which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims. t

In'the accompanying drawings, wherein 4a convenient embodiment of my invention is set forth,y Fig. 1 is an end elevation of a loom having Vmy invention applied thereto,

Fig. 2 is a detail viewv of parts ofFig. vI on an enlarged scale, f

shown in Fig. 2 butin a different position,

Fig. 4 is atopplanv view of the loom looking in the directionof arrow 4, Fig. 1, on an enlarged,l

scale, f

I Fig. 5 is a vertical section through the loom showing the center stop motion used with my invention, and Y' Fig. 6 is a vertical sectionI on line 6-6 of Fig. 5.

Referring tothe drawings, I have shown a breastbeam I, loomframe 2, and lay 3 pivoted at ll and having swords 5. Shifting shuttle boxes not shown `are located on the opposite side of the loom from that shown in Fig. 1. A change shaft I2 extends across the loom and performs the functions common to a similar shaft in the usual single color Stafford shuttle changing mechanism, such as is shown and described in United States Lettersy Patent No. 1,100,886 grantedJune 23, 1919, to S. S. Jackson. `In the present instance, however, shaft I2 .does Vadditional Work not called for in former Stafford changers.

A filling feeler,A mechanism, not shown herein but similar to that set forth in copending applica.-` tion Serial No. 603,051, of which this is al division, acts to stop the loom upon deciencyof illing,

`and start rotation of shaft I2, one complete rotation of which effects weft replenishment and starts the loom running again. When the change shaft I2 starts to rotate, box front 53 is Araised. by lifter 54- fulcrurned at 55 in stand 56 mounted on back of the lay. A cam 5l on shaft I2 effects this action by depressing lever 58 attached tolifter 54 by connector Se. Lever 58 is fulcrurned at 5I behind the shaft' I2. Y y

When the iront 53 is elevated to an extent sufli-v cient to permit ejection of a depleted shuttle, lifter 5&3 comes in Contact with screw 52 on ejector lever 63, causing the latter to rock on shaft 64 mounted on a lay carried stand 5t. Theejector 65 is thereupon moved forward beneath binder 65 to pushagainst the lower backl portion of the exhausted shuttle. 'I'he outgoing shuttle is thusprojected forwardly ofi the layY to carry its weft f 101 Fig. 3 is a diagrammat-ic'view of the vstructure thread toward the thread clamp to be described hereinafter.

A shuttle carrier |2| common to the stacks of shuttles, and normally in rear position, is moved by levers |28 secured to top shaft |29 when a shuttle change is to, occur. A crank |30 on the shaft |29 is pivotally connected to a link"|3`|, see Fig. 1, and reciprocated by a cam lever |32pivoting about fixed center 6|. The cam lever is actuated downwardly by a carn |33 on change shaft l2, and is raised by a spring |34. By this mechanism the lever |28 is first moved forwardly, or to the left as viewed in Figs. l and 2, and then rearwardly, for each shuttle changing operation. The matter thus far described may be the same as that shown in the aforesaidapplication Serial No.603,051. To permit the weaving of iine fabrics, I employ a center lling stop motion. The lay has a standy |46, Figs. 5 and S, to which is pivoted adagger 14| weighted so that its front pointed end tendsto rise. The filling fork has tines |42 movable about a lay carried pivot |43` and are secured to a small rocking element |44. A link |45 connects the element and dagger and a reciprocating rod |46 rises relatively to the lay every pick to raise the fork.' The Aparts are'so"`related Vthat the dagger will be held down when weftlis present, but will l L plenishingA beats of :the lay, since the center v rise if weft be absent from the shed.

The shipper shaft |41 has lxedthereon a ilnL ger |48 supporting a at spring |49. A stand |56 on the breast Vbeam supports a stub shaft |5| on which rocks a transmitting arm |52 lying justV behind iinger |48. A notch 53 in the arm isvadapted to receive the dagger |4| as the lay advances.

A shield |54 is loosely pivoted on shaft 15| and when down covers the notch. A resetting rodv |55 is arranged kto engage the lay when the' shield. is in the down positionshown in Fig. 5 and thus rock the shield back to normal nonshielding weaving position as the lay advances-on the first pick after the Vloom has been stopped. It should be noted thatthe dagger passes beyond the notch `before the rod and lay coact to reset the shield, so that on the first pick after-weaving is resumed the stop motion is incapable of l stopping the loom should filling be absent from the shed. This is Va normal operation necessitated byV the-conditions growing out of the correction of a mispick.

Fastened tothe breast beam isa spring Vlock |56 which yields to allow a hubV |51 on the shield to rise, the spring thereafter retaining thev shield yieldngly raised. When the shipper shaft rocks counter-clockwise as viewed in Fig.5, spring |49 will overpower spring |56 and move the shield down.' 'I'he center stop motion is not new,'a'nd is set forth to illustrate a shielded-type such as is found on certain looms.

The shield acts to permit the loom to restart after replenishment and continuerunning even though the last pick laid bythe outgoing `shuttle be defective, and to correct this-undesirable con-` dition I have provided thev mechanism set forth herein to detect a mispick on the beat on which weaving is resumed. vAs shown herein I employk a side stop motion modified, if desired, as shownl |60 along which the weft lies whenVV the shuttle is boxed at the magazine sideof the loom. A tiltable fork |6| is pivoted to a slide |62 mounted for back and forth motion in a guide |63 on theebreast beam. A loop |64 formed as part of the fork extends forwardly to coact with an actuator head |65 having a regular forward motion on alternate picksvwhen the shuttle-is boxed on the adjacentend of the'flay.

, When weft extends across the grid, the fork is tilted and the head moves forwardly with an idle stroke; Should the weft be absent, however, the fork remains in position to permit the head to, engagetheloop, afterY which continued forward motion of the head will cause the slide to advance. This'results in forward movement of a knock-pif lever |66 as will be understood by reference -to Fig.4 'and there follows the custolfmary movement of parts to stop the loom.

, When the lay stops to replenish, the flat spring |49 on the shipper shaft lowers the shield to cover notch |53.` When starting upafter re plenishment, therefore, the dagger |4I, Aeven thoughraisedias awresultof a defective pick, will be: deflected-away from :the notch. The shield will be'r'eset later inthe forward beat of thelay, and it' is during this-'interval `that the side fork will operatek to` stop'the loom. 'i It is suilicientl if :the .sidev fork. operates only vonA remotionidetects every pickexcept the one when shuttle change occurs.: When` a defective pick is iny the shed' the'lay will start up after replenishxnent, but' will be stopped by the side fork.

Anotherfeature offthe invention relates .toy a thread clamp to preserve the'tension ofthe last pick laid by the expelled-shuttle. In` bobbin changers the outgoing bobbin leaves the weft in thefshuttleeye, thereby preserving the tension should the yarnunwind completely. from the bobbin. Under-'similar circumstances ina shuttle changer, howeven'wtheyarn would pull out of 4the shuttle eyeandthe tension be lost.

. To'prevent this .undesirablev condition I form the inner magazine 'framewith a rear arm |15 and pivot' vthereon abell crank lever |16as at |11,"seeFig'sl 1, 2, 3 andl. An armi |18 -rigid with a shuttleadvancing arm |28 rocks with the latter. atlreplenishment.' Anv adjustable pin vand slot'` connection betweenA arm |18 andlever |16 m'ovesthe lower arm |19 of'said lever. Aclampv support |i`s pivoted to'arm |19 at |8| and held yieldinglyfin the position shownY in Fig. 2 by tension .spring |82. Stops limitthe amountY of relative motion of the parts about'pivot Il4 under `spring action.

Aretain'ing hook |83 pivoted to the magazine M is positioned byl a stop' |84 andais freely1movable upwardly. The-lower end of thesupport |80 has fixed and pivoted clamping blades |85" and |86, respectively. The Vmovable blade has' adependingactuating closing finger |81 and arr upper opening lug |88` for the `hook |83, see.

Fig-2... j

Normally, the blades [are in the'closed position` shown' in Figs. 1 and 2 but at replenishment, withl the layfat rest in'rear position; the lever" |23' will move. forwardlyras `described in'f'the afore said application Ser; No..`603,051 to move'the` shuttle carrier forwardly.` AtI the same time," the clamp .support |80 lwill move rearwardly, to

the full .line positionv in Fig.`.3, slightly behind;

that shown in Fig. 2, 'causing' the hook to open` the frictionally held movable blade 86. This re` leases any previously held thread, and forms a notch |89 `to receive-the thread of theputgoing shuttle. .Continued rear motion of the support causesnger I8? to strike the temporarily'stationary lay to return the movable blade to normal position relatively' to. the support; thereby clamping the thread of the outgoing shuttle; This thread is later cut at the selvage.

As the lever arm 28 moves rearwardly to advance a new shuttle toward the lay the parts movable about pivot lli return to their normal forward position shown in Fig. 2, the hook camming up over and falling behind the lug 138. If there be no thread for the clamp to grasp, the side stop motion will stop further weaving, but if weft be present and held across the fork by the clamp, conditions are proper for continued weaving, and the temporary disability of the fork to detect because of the clamped thread will do not harm.

From the foregoing it will be seen that I have provided means effective to prevent continuance of weaving in a shuttle changing loom which stops to effect replenishment if the last pick laid by the outgoing shuttle be defective. Although the structure shown herein contemplates a starting up of the loom which is to be immediately checked by the side stop motion, yet I do not wish to be limited to this arrangement inasmuch as I believe that I am the rst to provide means to prevent the weaving of a mispick in looms of this type where the fault is caused by the outgoing shuttle. It will also be seen that I have provided a clamp effective to retain the tension of the weft which extends through the shed when the latter is held open with the lay temporarily at rest in back position for replenishment purposes. It will also be seen that the side stop motion and clamp are so related that if there be no thread to clamp the stop motion will be free to act, but that if thread is present and is seized by the clamp the disability of the side stop motion would be of no consequence, since conditions are proper for continued weaving.

Having thus described my invention it will be seen that changes and modications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a shuttle changing loom which stops with the lay atibackcenter to effect shuttle change, means to replace a depleted shuttle with a fresh shuttle and then resume weaving operations, a center filling stop motion to detect the condition of weft in the shed every pick of the loom except the one immediately following the resumption of weaving, a thread clamp to hold the thread of the depleted shuttle after the latter has been ejected from the loom, and additional means to detect the condition of weft held by the clamp on said pick and prevent continued running of the loom if the thread laid by the expelled shuttle fails to be held by the clamp.

2. In a shuttle changing loom which stops to effect shuttle change, means to replace a depleted shuttle with a fresh shuttle while the loom is stopped and then resume weaving, a center stop motion normally operative every beat of the loom to detect the condition of weft in the shed, means operative to disable said center stop motion when the loom stops to change shuttles and render the stop motion inoperative to stop the loom during the beat on which weavingis resumed, a thread clamp to preserve tension of the weft in the shed, and means between the center stop motion and the clamp to detectthe condition rif-weft laid by the outgoing shuttle onalternate beats of the loom and on the beatwhen the centerst'op motion is disabled and vprevent contilmed'loomcpern ation after resumption'of weaving if said weft bedefective.` f li f 3. In a shuttle changing loom which stops to effect shuttle change, a center lling stop motion normally effective to stop the loom on any beat on which weft fault occurs and having a shield movable when the loom stops to render the center stop motion ineffective to stop the loom on the first beat after resuming operation, means to expel a depleted shuttle from the loom when the same is stopped for replenishment, a thread clamp to preserve tension of the weft in the shed, replenishing mechanism to place a fresh shuttle in the loom, and means between the center stop motion and the clamp to prevent continued running of the loom after the fresh shuttle has been placed intoaction if thelast pick laid by the expelled shuttle is defective.

4. In a shuttle changing loom which stops to effect shuttle change, means to expel the depleted shuttle and replace the same with a fresh shuttle and then resume Weaving operations, a center stop motion effective to detect the condition of weft in the shed on all beats of the loom except the one immediately following the. resumption of weaving operation, a thread clamp to preserve tension of the weft in the shed, and means independent of the center stop motion between the center stop motion and the clamp todetect the condition of the last pick laid by the expelled shuttle and prevent continued loom running after replenishment if said last pick laid by the expelled shuttle is defective.

5. In a shuttle changing loom which stops to effect shuttle change, discharge means to expel' the depleted shuttle and replace the same with a fresh shuttle and then resume weaving operations, a center stop motion effective to detect the condition of. weft in the shed on all beats of the loom except the one immediately following the resumption of weaving operation after shuttle changing, a thread clamp to preserve tension of the weft in the shed, and a sidestop motion on that side of the loom adjacent the discharge` means between the center stop motion and the clamp, said side stop motion effective todetect for weft on alternate beats of the loom and effective to prevent continued running of theloom after shuttle change if the last pick laid by the expelled shuttle is defective.

6. In a shuttle changing loom which stops to eiTect shuttle change, means to replace a depleted shuttle with a fresh shuttle while the loom is stopped and then resume weaving, a .lay which is at rest during the time that the depleted shuttle is expelled from the loom, a thread clamp movable by the means into engagement with the stationary lay, said engagement causing the clamp to catch and hold the weft of the. outgoing shuttle and preserve the tension of the weft in the shed.

the tltable fork being between the fabric and and drawing the same across `the tiltable `fork, the .thread clamp, the side stop motion eieotive the side .stop motion thereby being rendered into prevent continued running of the loom if the effective to stop the loom because of the factthat clamp fails to grasp a weft should the last pick 'the last pick laid by the outgoing shuttle is corn- 5 laid by thev outgoing shuttle be short, andsaid plete. A

clamp catching the thread of the outgoingweft LEWIS VOSE 

